ARM: shmobile: r8a7779: Replace modify_scu_cpu_psr with scu_power_mode

We can remove the extra code of modify_scu_cpu_psr() and use the cleaner
generic ARM helper scu_power_mode(). As every CPU only deals with its
own power register and scu_power_mode() operates with 8-bit accesses,
we save the locking overhead too.

Signed-off-by: Bastian Hecht <hechtb@gmail.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

arch/arm/mach-shmobile/smp-r8a7779.c

@@ -61,9 +61,6 @@ static void __iomem *scu_base_addr(void)
 	return (void __iomem *)0xf0000000;
 }
 
-static DEFINE_SPINLOCK(scu_lock);
-static unsigned long tmp;
-
 #ifdef CONFIG_HAVE_ARM_TWD
 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, 0xf0000600, 29);
 
@@ -73,20 +70,6 @@ void __init r8a7779_register_twd(void)
 }
 #endif
 
-static void modify_scu_cpu_psr(unsigned long set, unsigned long clr)
-{
-	void __iomem *scu_base = scu_base_addr();
-
-	spin_lock(&scu_lock);
-	tmp = __raw_readl(scu_base + 8);
-	tmp &= ~clr;
-	tmp |= set;
-	spin_unlock(&scu_lock);
-
-	/* disable cache coherency after releasing the lock */
-	__raw_writel(tmp, scu_base + 8);
-}
-
 static unsigned int __init r8a7779_get_core_count(void)
 {
 	void __iomem *scu_base = scu_base_addr();
@@ -102,7 +85,7 @@ static int r8a7779_platform_cpu_kill(unsigned int cpu)
 	cpu = cpu_logical_map(cpu);
 
 	/* disable cache coherency */
-	modify_scu_cpu_psr(3 << (cpu * 8), 0);
+	scu_power_mode(scu_base_addr(), 3);
 
 	if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
 		ch = r8a7779_ch_cpu[cpu];
@@ -145,7 +128,7 @@ static int __cpuinit r8a7779_boot_secondary(unsigned int cpu, struct task_struct
 	cpu = cpu_logical_map(cpu);
 
 	/* enable cache coherency */
-	modify_scu_cpu_psr(0, 3 << (cpu * 8));
+	scu_power_mode(scu_base_addr(), 0);
 
 	if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
 		ch = r8a7779_ch_cpu[cpu];
@@ -158,15 +141,13 @@ static int __cpuinit r8a7779_boot_secondary(unsigned int cpu, struct task_struct
 
 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
 {
-	int cpu = cpu_logical_map(0);
-
 	scu_enable(scu_base_addr());
 
 	/* Map the reset vector (in headsmp.S) */
 	__raw_writel(__pa(shmobile_secondary_vector), AVECR);
 
 	/* enable cache coherency on CPU0 */
-	modify_scu_cpu_psr(0, 3 << (cpu * 8));
+	scu_power_mode(scu_base_addr(), 0);
 
 	r8a7779_pm_init();